As far as we're aware in order to unlock your Samsung Galaxy S 2, you will first need to root it. Follow the instructions below carefully to unlock and root your Samsung Galaxy S 2. Before beginning the process it's always wise to back-up all the information currently on your Samsung Galaxy S 2.

How to root your Samsung Galaxy S2

Here’s a step by step guide to rooting your Galaxy S2.

First thing you need is a Samsung Galaxy S2 with at least 50% battery.

Aninsecurekernel - as standard you have a secure kernel on your S2. The insecure kernel opens your phone up to be rooted. When downloading the insecure kernel, choose a kernel number closest to that on your S2. You can see your kernel number in the about section in your settings, as illustrated in the video.

Hit the "SIM unlock code" button, wait a few minutes and the code should appear.

It can take a while, so don't panic if nothing happens.

Once you get the unlock code, write it down and keep it safe. Then simply switch off your phone and put in your giffgaff SIM card.

You will be prompted to enter your SIM unlock code shortly after you turn it on. Once the code is entered, you should have yourself an unlocked Samsung Galaxy S2 free to make the most of the giffgaff network.

There is a chance that this unlock method won’t work. If it doesn’t, don’t try it again as this could be harmful to your phone.

Instead, download an alternative unlock tool from the Google Play Store called - GalaxySUnlock.

Once installed, open the application and grant it Superuser permision. Once granted, select the unlock tab at the top, select step 1, “Save actual EFS folder”. Once complete, select step 2, “SIM unlock”. Your phone will then need to be rebooted. Once up and running, reopen the application, and select step 3. Create BAK file.

On the off chance this method doesn’t work, follow the in-app instructions to get your phone back to its original state.

Between these two methods, you should have an unlocked Samsung Galaxy S2. For other methods of unlocking, just follow the links below and enjoy your new found freedom on the giffgaff network.

Have you unlocked your Samsung Galaxy S 2? Did you use one of the above apps - tell us how you found the process in the comments below.